Best active speaker

PMC
http://www.pmc-speakers.com/productCats.php?mode=productCats&cid=5

Other PMC active model-
PMC´s latest active monitor, the IB2S XBD-A. Similar to the industry-standard BB5 XBD-A but lighter and more affordable, and aimed at high-end reference monitoring and mastering applications, each IB2S XBD-A monitor consists of two DSP-controlled, Class-D powered cabinets fitted with PMC´s ATL™ (Advanced Transmission Line) technology: a three-way master and a slave XBD cabinet with an extra bass driver. Each channel employs two of the 10-inch piston bass drivers from the renowned IB1S and IB2S speakers, together with PMC’s hand-built 75mm mid-range fabric-dome driver and the 34mm soft-dome tweeter from the BB5 XBD-A. Each active master cabinet offers 960W of power (200W each from the HF and mid-range drivers, 560W from the LF driver) while the slave XBD cabinets contribute a further 560W, making for 1520W per channel of superbly controlled, low-distortion precision monitoring all the way down to below 20Hz. Controllable via an RJ45 remote, with user-adjustable HF and LF shelving filters, per-channel ±8dB input level trims, analogue input sensitivity from +4dB to +20dB and an AES3 digital input as standard, the IB2S XBD-A is scheduled to ship this summer.

PMC AML2 is well worth a demo!. Great review on the AML1 on 6moons.

Check out the avi adm9.1s + subwoofer. Remote controlled analog pre, DAC and active speakers all in one cabinet for around $4500 including the subwoofer. What HiFi just reviewed them.

Along with ATC, I would suggest also auditioning the Adam powered speakers. They use a Class D amplifier for the woofer; not sure what the fully powered version uses for the other drivers. I was very impressed with them, particularly due to their ribbon midrange and tweeter drivers, a very open and airy, "fast" sound akin to what you hear in live music.

ATC is the way to go. Sound is better, in my opinion.

Can't go wrong with ATC but you know that.

Consider also Focal Twin 6 - a real bargain in active designs and obviously a step up from the passive electra 1007 (but you lose all that pretty and very expensive cosmetics for better sound and more expensive stuff inside the box).

Large PMC's have clones of ATC's famous mid range (emulation = sincerest form of flattery). So that is another extremely good choice with more bass on PMC's than with ATC. Plus the excellent Volt woofers with external brackets/heat sinks look like something out of a Batman movie - very very cool.

Finally Barefoot MM27 may be worth checking out if you want an extremely small package that will have people picking up their jaws off the floor when you fire them up.